Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 607	$ 183
Liability Fair Value	490	475
Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	177	135
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	177	135
Not Designated as Hedging Instrument \| Derivatives \| Credit contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	1
Liability Fair Value	3	1
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	941	923
Foreign exchange contracts \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Amount	159	146
Foreign exchange contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	7	1
Liability Fair Value	3	3
Foreign exchange contracts \| Fair Value Hedging \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Amount	82	94
Foreign exchange contracts \| Fair Value Hedging \| Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	2	2
Liability Fair Value	0	0
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Amount	700	683
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	126	16
Liability Fair Value	0	16
Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	13,439	12,003
Interest rate contracts \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Amount	19,370	13,382
Interest rate contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	358	147
Liability Fair Value	371	209
Interest rate contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Amount	22	22
Interest rate contracts \| Cash Flow Hedging \| Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	0
Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	197	239
Equity contracts \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Amount	245	299
Equity contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	2	4
Liability Fair Value	6	2
Fixed maturities \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Fair Value	3	12
Liability Fair Value	0	0
Within products(3) \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	24	47
Within reinsurance agreements(4) \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Fair Value	109	0
Liability Fair Value	74	196
Managed custody guarantees(3) \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	$ 9	$ 1

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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